Resonance from Contactless Ultrasound in Alloy Melts

被引：4

作者：

Tonry, C. E. H. ^{[1
]}

Djambazov, G. ^{[1
]}

Dybalska, A. ^{[2
]}

Bojarevics, V ^{[1
]}

Griffiths, W. D. ^{[2
]}

Pericleous, K. A. ^{[1
]}

机构：

[1] Univ Greenwich, Computat Sci & Engn Grp, Pk Row, London SE10 9LS, England

[2] Univ Birmingham, Sch Met & Mat, Birmingham B15 2TT, W Midlands, England

来源：

LIGHT METALS 2019 | 2019年

基金：

英国工程与自然科学研究理事会;

关键词：

Ultrasonic cavitation; Electromagnetism; Contactless ultrasound; Alloy melts; Resonance; ACOUSTIC CAVITATION;

D O I：

10.1007/978-3-030-05864-7_196

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Contactless ultrasound uses Lorentz forces from a secondary coil to induce ultrasonic vibrations in alloy melts. To achieve pressures high enough for cavitation, resonance is required. However, the prediction of the resonant modes for a melt in a crucible is complex, due to the transmission and reflection of sound within the crucible walls. Two acoustic models, one solving a simplified momentum equation in the time domain, the other solving the Helmholtz equation in the frequency domain are compared. The frequency domain model allows a fast sweep of frequencies for resonance tuning, and the transient model enables a more detailed analysis. Validation is against analytic test cases derived with boundary conditions specific for the liquid metal medium and against experimental data obtained in an aluminum melting crucible. Results confirm that sound transmission into the crucible walls has a significant effect on resonant frequencies and needs to be accounted for.

引用

页码：1551 / 1559

页数：9

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